EP 1399598 B1 20041013 - METHOD FOR PRODUCING HIGH-STRENGTH COLD-FORMED STEEL PRODUCTS FROM A HOT ROLLED STRIP, SAID PRODUCTS EXHIBITING GOOD MALLEABILITY
Title (en)
METHOD FOR PRODUCING HIGH-STRENGTH COLD-FORMED STEEL PRODUCTS FROM A HOT ROLLED STRIP, SAID PRODUCTS EXHIBITING GOOD MALLEABILITY
Title (de)
VERFAHREN ZUM HERSTELLEN VON HOCHFESTEN, AUS EINEM WARMBAND KALTVERFORMTEN STAHLPRODUKTEN MIT GUTER DEHNBARKEIT
Title (fr)
PROCEDE POUR FABRIQUER DES PRODUITS EN ACIER DE GRANDE RESISTANCE ET DE BONNE MALLEABILITE, FORMES A FROID A PARTIR D'UN FEUILLARD LAMINE A CHAUD
Publication
Application
Priority
- DE 10130774 A 20010626
- EP 0206870 W 20020621
Abstract (en)
[origin: WO03002772A1] The invention relates to a method for producing a high-strength cold-formed product from a hot-rolled strip, said product exhibiting good malleability. According to said method, a steel comprising (in wt.%): C: 0.01 0.25 %, Si: 0.01 1.50 %, Mn: 0.50 2.00 %, P: <= 0.08 %, S: <= 0.01 %, Al: 0.001 1.50 %, Cr: <= 0.60 %, Mo: <= 0.60 %, N: < 0.02 %, at least one micro-alloy element from the group Ti: <= 0.20 %, Nb: <= 0.06 %, V: <= 0.15 %, the remainder being iron and the usual impurities is cast to form an input stock such as slabs, thin slabs or a cast strip. Starting from an initial hot-roll temperature, at which the micro-alloy elements remain essentially dissolved, the input stock is hot-rolled to form a hot-rolled strip. Said strip is firstly wound at a winding temperature of less than 600 DEG C and then cold formed into a product at a cold formation degree which is not less than 2 % and not greater than the deformation limit. The cold-formed product is annealed at a temperature and for a period which are less those required for complete recrystallization. The inventive method enables a cold formed product to be produced, said product exhibiting high strength, malleability and plasticity in the cold formed state.
IPC 1-7
IPC 8 full level
C21D 8/02 (2006.01)
CPC (source: EP)
C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0273 (2013.01); C21D 8/0278 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 03002772 A1 20030109; AT E279540 T1 20041015; DE 10130774 C1 20021212; DE 50201321 D1 20041118; EP 1399598 A1 20040324; EP 1399598 B1 20041013; EP 1399598 B2 20110223; ES 2230500 T3 20050501
DOCDB simple family (application)
EP 0206870 W 20020621; AT 02738172 T 20020621; DE 10130774 A 20010626; DE 50201321 T 20020621; EP 02738172 A 20020621; ES 02738172 T 20020621